omega_rugal Posted August 15, 2019 Share Posted August 15, 2019 i found this chart in wikipedia: where is the 3.55 ratio? also according to this mixing a 3.07 ring gear with a 3.54 pinion it gives the rare 3.31, is that correct? it´s for a homework... Link to comment Share on other sites More sharing options...
Eagle Posted August 16, 2019 Share Posted August 16, 2019 The Dana 30 had 3.55 gears. The Dana 35 had 3.54. Functionally, they are the same. Link to comment Share on other sites More sharing options...
Pete M Posted August 16, 2019 Share Posted August 16, 2019 13:46 is the tooth count for a certain size axle. but axles can big bigger/smaller and need different tooth counts in order to fit the space available. other axles might have a 11:39 tooth count which comes to 3.545 which is rounded up to 3.55 4.09/4.10/4.11 are the same sort of thing: 45:11, 41:10 and 37:9 respectively. Link to comment Share on other sites More sharing options...
Pete M Posted August 16, 2019 Share Posted August 16, 2019 2 hours ago, omega_rugal said: i found this chart in wikipedia: also according to this mixing a 3.07 ring gear with a 3.54 pinion it gives the rare 3.31, is that correct? just because they have the same tooth count doesn't mean that the individual teeth are the same shape. Link to comment Share on other sites More sharing options...
Minuit Posted August 16, 2019 Share Posted August 16, 2019 7 minutes ago, Pete M said: just because they have the same tooth count doesn't mean that the individual teeth are the same shape. Yep, yep. As long as the gears are of compatible tooth profiles and will actually mesh properly, a 3.31:1 ratio is a 3.31:1 ratio no matter what box the gears came in. So if you had a bunch of gears with the same profile and different tooth counts, you can mix and match all you like. I'm not a rear end guy, but I kind of doubt it's that simple in practice. Someone who has more experience working with differentials would have to confirm, but I'm not so sure that a 3.07 ring gear and a 3.55 pinion gear are compatible even if the tooth counts work out. If it would work, that's my learning lesson for the day I guess. Link to comment Share on other sites More sharing options...
Jeep Driver Posted August 16, 2019 Share Posted August 16, 2019 Thicknesses and diameters...............I don't think you can mix and match. Link to comment Share on other sites More sharing options...
omega_rugal Posted August 16, 2019 Author Share Posted August 16, 2019 so each pinion-ring combo is unique? Link to comment Share on other sites More sharing options...
Pete M Posted August 16, 2019 Share Posted August 16, 2019 absolutely. it takes a lot of geometry to get the gears to mesh properly. Link to comment Share on other sites More sharing options...
DirtyComanche Posted August 17, 2019 Share Posted August 17, 2019 22 hours ago, omega_rugal said: so each pinion-ring combo is unique? Yup. You can't just grab a pinion from one ratio and a ring gear from the other. They may be able to mesh if you shim them enough, but you'll never run the correct pattern. Beyond that, gears are matched as sets of a pinion and a ring gear... You can't really get away with using a pinion or ring gear from one set in another, even if they're the same ratio and brand. In theory if they're the same brand and ratio, and the checking distance is marked the same, and they're from the same batch, you can get away with it, but it's just not a great idea (and I can't see any scenario in which you would want to do this). Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now